304 Orthonhapha biachycera. 



Schin. F. A. 1, 89 {Platypalpus). — 1903. Kat. palaarkt. Dipt. II, 281. — 

 Tachydromia ventralis : 1822. Meig. Syst. Beschr. III, 85, 40. — Platy- 

 palpus ventralis: 1862. Schin. F. A. I, 88. 



Male. Head somewhat high. Vertex and frons grey, the latter 



very narrow; epistoma white; palpi pale yellow, large, half as long 



as proboscis. Occiput grey, with yellow bristles above, white hairs 



below. Antennæ black or blackish, the two basal joints yellow, the 



third joint a little elongated, shorter than the arista. Thorax grey or 



light grey pruinose, with two indistinct, darker grey stripes in the 



middle, abbreviated behind, and generally only observable in front; 



there are (generally) only two notopleural bristles; all bristles whitish 



or whitish yellow. Scutellum with four pale yellow^ marginal bristles, 



the lateral shortest. Pleura light grey pruinose ; no black spot above 



the middle coxæ. Abdomen black, shining, with distinct grey bands 



at the sides; it is clothed with short, pale yellow hairs. Venter black, 



often more or less yellow. Legs yellow, generally pale yellow, the 



last tarsal joints brownish or blackish; sometimes the tarsi indistinctly 



brownish annulated. Front femora 



almost not, middle femora a little 



thickened. The legs are yellowish 



haired. Wings hyaline, slightly yellowish 



tinged. Veins darker or paler yellow; 



cubital and discai vein nmch converging 



,,. ,„„ „,. T'r.^ 7- in siich a way, that the cubital vein 



Fig. 138. Wing-part 01 j.ca«fMca»s. \ ^ 



is slightly curved, almost straight, the 

 discai vein bending upw^ards with a long curve. Halteres whitish. 



Female. Similar to the male; abdomen pointed. 



Length. This species varies much in size, the length is 2,5— 4 mm. 



This species is easily known by the absence of the black spot 

 on the pleura, and the strongly curved discai vein; also its narrow 

 frons and slightly thickened anterior femora are characteristic. 



T. candicans is common in Denmark; Copenhagen in a garden, 

 Ordrup Mose, Dyrehaven, Tyvekrog; on Langeland at Lohals; on 

 Funen at Odense and Hoffmansgave; in Jutland at Nebsager near 

 Horsens, and fmally on Bornholm at Almindingen; my dates are ^^/C 

 to August. It occurs on bushes near and in woods, not rarely on 

 somewhat shaded and humid piaces. 



Geographical distribution: — Europe down into Italy; towards 

 the north to noi'thern Sweden, and in Finland. 



